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Contribution de l'hydrogéomorphologie à évaluation du risque d'inondation : le cas du Midi méditerranéen français

Abstract : The hydrogeomorphological method to delimiting flood risk zones in France was developed some twenty years ago. It is based on a simple principle : the outer limits of a stream’s flood plain constitute the outer envelope of past floods. These limits are determined with the use of aerial photographs and field surveys of micro-topography as well as analyses of deposit granulometry and colour. Indications of present or past land use (fields, location and distribution of archaeological sites, houses and farm buildings, roads) are also useful. This field based method long remained ignored but being reliable, easy to use and inexpensive, it has now been incorporated into the package of methods recommended by French risk prevention plans (PPRI). The many recent catastrophes that have occurred over the past fifteen years in the Mediterranean regions of southern France demonstrated both the inadequacy of the hydrological-hydraulic method and the reliability of the hydrogeomorphological method. The hydrogeomorphological method can, however, be improved by setting observations for the present period against information on the more ancient Holocene evolution of flood plains.
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Jean-Louis Ballais, Gérald Garry, Marcel Masson. Contribution de l'hydrogéomorphologie à évaluation du risque d'inondation : le cas du Midi méditerranéen français. Comptes Rendus Géoscience, Elsevier Masson, 2005, 337 (13), pp.1120-1130. ⟨10.1016/j.crte.2005.06.010⟩. ⟨hal-01570132⟩

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